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Biology 2 Mollusk Test

True/False
Indicate whether the statement is true or false.
 

 1. 
Most mollusks are aquatic.
 

 2. 
Mollusks have a pseudocoelom.
 

 3. 
Most mollusks have a closed circulatory system.
 

 4. 
All mollusks have a shell.
 

 5. 
All mollusks have a mantle.
 

 6. 
Most mollusks are freshwater organisms.
 

 7. 
Mollusks are vertebrates.
 

 8. 
Bi-valves have a well developed radula.
 

 9. 
Clams tend to be female early in their life cycle and male later in their life cycle.
 

 10. 
Squid and octopi usually live 5-10 years on average.
 

 11. 
Squid and octopi usually lay eggs through 5-6 breeding cycles.
 

 12. 
Sometimes female squid will rip a tentacle off of a male squid during fertilization.
 

 13. 
Most gastropods have separate sexes.
 

 14. 
Gastropods are pretty much found everywhere on the face of the earth.
 

 15. 
All gastropods have shells.
 

 16. 
All bivalves have shells.
 

 17. 
Squid and octopi will eat members of their own kind.
 

 18. 
Some mollusks can have thousands of teeth in their mouth.
 

 19. 
Bivalves can detect light levels and touch.
 

 20. 
Cephalopods have a radula.
 

 21. 
Bivalves do not have a heart and use diffusion as their circulatory system.
 

 22. 
Squid, cuttlefish, and octopi can change their skin color.
 

 23. 
Cephalopods tend to be filter feeders.
 

 24. 
Squid and octopi can vary in size but most are small.
 

 25. 
A nautilus has eight arms total.
 

 26. 
A squid tentacle can have sharp hooks.
 

 27. 
Squid can swim forward or backward.
 

 28. 
Snails have eyes.
 

 29. 
Phylum Molluska is the 2nd largest animal phylum in total organisms.
 

 30. 
Some mollusks exhibit smarter behavior than some mammals.
 

 31. 
Mollusks exhibit segmentation.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 32. 
Mollusks have ______________ symmetry.
a.
bilateral
c.
radial
b.
no
 

 33. 
Mollusks have a(n) ________________ level of organization.
a.
cellular
c.
organ
b.
tissue
 

 34. 
Which cephalopod has a shell?
a.
squid
c.
nautilus
b.
octopus
d.
cuttlefish
 

 35. 
Which cephalopod does not have shell?
a.
squid
c.
nautilus
b.
octupus
d.
cuttlefish
 

 36. 
Mollusk blood is called ____________ and the respiratory pigment is called ____________.
a.
hemolymph, hemocyanin
d.
hemolymph, hemocoel
b.
hemocyanin, hemolymph
e.
hemocyanin, hemoglobin
c.
hemolymph, hemoglobin
 

 37. 
Which cephalopod has a poisonous bite?
a.
squid
c.
nautilus
b.
octopus
d.
cuttlefish
 

 38. 
How many hearts does a squid have?
a.
1
d.
4
b.
2
e.
5
c.
3
 

 39. 
How many hearts does an octupus have?
a.
1
d.
4
b.
2
e.
5
c.
3
 

 40. 
Which cephalopod is considered the “smartest”?
a.
squid
c.
nautilus
b.
octopus
d.
cuttlefish
 

 41. 
Which cephalopod can float at different depths in the water due to an air bladder?
a.
squid
c.
nautilus
b.
octopus
d.
cuttlefish
 

 42. 
What does the term cephalopod mean?
a.
head-foot
c.
back-foot
b.
stomach-foot
d.
2 shells
 

 43. 
What does the term gastropod mean?
a.
head-foot
c.
back-foot
b.
stomach-foot
d.
2 shells
 

 44. 
Which is not a function of the shell?
a.
protection from predators
b.
acts as a primitive lung in a land snail for respiration
c.
prevents dessication of the organism
d.
locomotion
e.
all of these are functions
 

 45. 
Where are the gills of nudibranchs?
a.
stomach
c.
head
b.
back
d.
feet
 

 46. 
Which is not a gastropod?
a.
whelk
d.
slug
b.
conch
e.
cuttlefish
c.
sea hare
f.
periwinkle
 

 47. 
Which is a nudibranch?
a.
whelk
d.
sea slug
b.
conch
e.
slug
c.
sea hare
 

 48. 
Which gastropod mates in mid-air?
a.
slug
d.
whelk
b.
snail
e.
periwinkle
c.
limpet
 

 49. 
Which exhibits poor cephalization?
a.
bivalve
c.
gastropod
b.
cephalopod
 

 50. 
Which bivalve is the “smartest”?
a.
clam
c.
oyster
b.
mussel
d.
scallop
 

 51. 
Which bivalve can swim?
a.
oyster
c.
scallop
b.
mussel
d.
clam
 

 52. 
Which bivalve has eyes?
a.
clam
c.
scallop
b.
mussel
d.
oyster
 

 53. 
Which bivalve changes sexes every year?
a.
clam
c.
oyster
b.
mussel
d.
scallop
 

 54. 
Female ____________ guard their eggs.
a.
squid
b.
octopi
 

 55. 
_______________ are carnivores, _____________ are herbivores, and ______________ are filter feeders.
a.
cephalopods, gastropods, bivalves
d.
cephalopods, bivalves, gastropods
b.
bivalves, gastropods, cephalopods
e.
gastropods, bivalves, cephalopods
c.
gastropods, cephalopods, bivalves
 

 56. 
Which group has hermaphrodites in it?
a.
gastropods
c.
bivalves
b.
cephalopods
d.
chitons
 

 57. 
Which group has a closed circulatory system?
a.
gastropods
c.
bivalves
b.
cephalopods
d.
chitons
 

 58. 
Which group tends to be sessile?
a.
bivalves
c.
gastropods
b.
cephalopods
d.
chitons
 

 59. 
Which group has a poorly developed nervous system with simple ganglion and which group has a well developed system with brains
a.
bivalves then gastropods
d.
cephalopods then gastropods
b.
gastropods then bivalves
e.
bivalves then cephalopods
c.
gastropods then cephalopods
 

 60. 
The largest group of mollusks with the most species is the
a.
bivalves.
c.
gastropods.
b.
cephalopods.
 

 61. 
Which characteristic is not found in the class Gastropoda?
a.
anus directly over the head
d.
carnivores use the radula to drill holes in shells of bivalves
b.
torsion of the body
e.
swimming larvae are found in all forms
c.
mantle may form gills or functional lungs
 

 62. 
How many pairs of tentacles do land snails usually have?
a.
1
c.
3
b.
2
d.
4
 

 63. 
Do terrestrial snails have ammonia or uric acid as their excretion?
a.
ammonia
b.
uric acid
 

 64. 
Chitons are
a.
herbivores.
c.
filter feeders.
b.
carnivores.
 

 65. 
Which is not a function of the arms for an octopus?
a.
movement
d.
reproduction
b.
tasteing
e.
none, they all are functions
c.
grabbing prey
 

 66. 
What does a female squid do with her eggs?
a.
lay them on strings on the substrate
c.
hide them in holes and crevices
b.
bury them in the substrate
d.
carry them until they hatch
 

 67. 
What is the problem with torsion?
a.
waste empties near the head
c.
the foot is above the organs
b.
it is harder to reproduce
d.
animals cannot be complex
 

 68. 
Which group has the best sensory receptors?
a.
bivalves
c.
cephalopods
b.
gastropods
 

 69. 
What is the defining characteristic of chitons?
a.
8 fused plates on its back
c.
many arms on its head
b.
stinging cells
d.
huge incurrent siphon to filter feed
 

 70. 
A clams digestive tract runs through which organ?
a.
brain
d.
heart
b.
lung
e.
liver
c.
kidney
f.
pancreas
 

 71. 
Complex animals with a coelom are divided into
a.
protostomes and deuterostomes
b.
segmented, tissue, or organ level animals
c.
monoblastic, diploblastic, or triploblastic animals
d.
asymmetrical, bilateral, or radially symmetrical animals
 

Multiple Response
Identify one or more choices that best complete the statement or answer the question.
 

 72. 
Select all of the following that can form a pearl.
 a.
oyster
 c.
clam
 b.
snail
 d.
scallop
 

 73. 
Which two mollusks have a penis?
 a.
squid
 e.
scallop
 b.
snail
 f.
slug
 c.
clam
 g.
oyster
 d.
octopus
 h.
chambered nautilus
 

 74. 
What tricks do squid or octopi use to escape predators?
 a.
ink
 d.
rip off an arm
 b.
camouflage
 e.
make loud sounds
 c.
mimicry
 

 75. 
Which of the following ways can cephalopods propel themselves through the water?
 a.
walk
 c.
jet propulsion
 b.
swim backwards
 d.
swim forwards
 

 76. 
All mollusks have which of the following characteristics?
 a.
shell
 d.
visceral mass
 b.
mantle
 e.
siphons
 c.
foot
 f.
seperate sexes
 

 77. 
Check all muscles found in a bivalve.
 a.
anterior adductor
 d.
foot
 b.
posterior retractor
 e.
anterior retractor
 c.
posterior adductor
 

 78. 
Which of the following structures help trap food for a clam?
 a.
cilia
 d.
incurrent siphon
 b.
mucous
 e.
gonad
 c.
gills
 f.
ganglion
 

Completion - you must spell the word correctly or it is wrong! Copy and paste!
tropical whelk              incurrent siphon         beak         blue-ringed octopus         torsion
calcium carbonate       ammonia                    gills           kidneys                          spawning
 

 79. 
The substance which makes up the shells of mollusks is made up of ________________  _________________.
 

 

 80. 
Name the process that puts the body over the head in gastrods.
 

 

 81. 
Name the excretory organ in bivalves and cephalopds?
 

 

 82. 
Squid and octopus have a ______ to rip apart prey.
 

 

 83. 
The anus in bivalves empties next to the __________________________________.
 

 

 84. 
Releasing eggs and sperm into the water is called ______________________.
 

 

 85. 
Name the respiratory structure in aquatic animals where oxygen diffuses across its thin membrane.
 

 

 86. 
This cephalopod is extremely deadly to humans.
 

 

 87. 
This gastropod is deadly to humans.
 

 

 88. 
Name the cellular waste excretion of bivalves and cephalopods.
 

 

Matching
 
 
a.
protostome
b.
deuterostome
 

 89. 

 radial cleavage
 

 90. 

 forms an enterocoelom
 

 91. 

 forms anus first
 

 92. 

 coelom formed by splitting of the mesoderm
 

 93. 

 spiral cleavage
 

 94. 

 coelom formed from folding of gut
 

 95. 

 forms mouth first
 

 96. 

 forms a schizocoelom
 
 
Structures
a.
gonad
f.
dessication
b.
cecum
g.
operculum
c.
pen
h.
trochophore
d.
ctenidium
i.
byssal
e.
radula
 

 97. 

 sticky threads used to keep a larva in place
 

 98. 

 a mouth-like part
 

 99. 

 a vestigial skeleton
 

 100. 

 a swimming larval form
 

 101. 

 calcified door used to close the opening of the shell in gastropods
 

 102. 

 squid intestine
 

 103. 

 sexual structure in mollusks
 

 104. 

 feather-like gills
 

 105. 

 drying out
 
 
a.
0
g.
6
b.
1
h.
7
c.
2
i.
8
d.
3
j.
9
e.
4
k.
10
f.
5
l.
over 10
 

 106. 

 how many arms does a squid have
 

 107. 

 how many arms does an octopus have
 

 108. 

 how many tentacles does a squid have
 

 109. 

 how many tentacles does an octopus have
 

 110. 

 how many arms does a chambered nautilus have
 



 
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